#include<stdio.h>
#include<stdlib.h>
void swap(int *x, int *y)
{
    int *t;
	t = x;
    x = y;
    y = t;
    return;
}
int main()
{
    int a = 3, b = 4;
    swap(&a,&b);
    printf("%d %d\n", a, b);
    return (0);
}
